INTEGRASI DATA REACTIVITY COMPUTER KE SISTEM INTERNET REACTOR LABORATORY (IRL) REAKTOR KARTINI

Reactivity Computer merupakan modul elektronika yang digunakan untuk mengukur reaktivitas dari hasil pembelahan inti diteras reaktor. Sebelumnya sinyal keluaran reactivity computer diolah dan hanya ditampilkan pada layar reactivity computer, namun penunjukannya belum terintegrasi dengan sistem IRL. Sehingga saat praktikum pengukuran reaktivitas batang kendali, peserta kesulitan untuk mengambil data karena perhatian peserta terbagi antara tampilan IRL dan tampilan reactivity computer. Agar dapat diintegrasikan dalam sistem IRL, keluaran reactivity computer perlu dikonversi ke dalam besaran digital, baru kemudian diakuisisi ke dalam sistem IRL. Untuk mencapai tujuan tersebut, dalam penelitian ini dilakukan beberapa tahap, pertama pembuatan rangkaian pengkondisi sinyal karena sinyal dari reactivity computer bernilai -10V sampai +10 Volt DC sementara analog digital converter (ADC) yang tersedia hanya mampu mengukur tegangan 0-5 Volt DC. Kedua pengujian rangkaian pengkondisi sinyal. Ketiga pembuatan sistem akuisisi data dari ADC ke IRL dan terakhir pengujian sistem secara keseluruhan. Setelah seluruh tahap dilakukan, nilai reaktivitas dapat ditampilkan di tampilan IRL, dengan perbedaan penunjukan antara display reactivity computer dengan tampilan di IRL sebesar 1.1%.

Reprogrammable plasmonic topological insulators with ultrafast control

Topological photonics has revolutionized our understanding of light propagation, providing a robust way to manipulate light. So far, most of studies in this field are focused on designing a static photonic structure. Developing a dynamic photonic topological platform to switch multiple topological functionalities at ultrafast speed is still a great challenge. Here we theoretically propose and experimentally demonstrate a reprogrammable plasmonic topological insulator, where the topological propagation route can be dynamically changed at nanosecond-level switching time, leading to an experimental demonstration of ultrafast multi-channel optical analog-digital converter. Due to the innovative use of electric switches to implement the programmability of plasmonic topological insulator, each unit cell can be encoded by dynamically controlling its digital plasmonic states while keeping its geometry and material parameters unchanged. Our reprogrammable topological plasmonic platform is fabricated by the printed circuit board technology, making it much more compatible with integrated photoelectric systems. Furthermore, due to its flexible programmability, many photonic topological functionalities can be integrated into this versatile topological platform.

Indonesian Sign Language Interpreter Device Based on ATMega328 Microcontroller for Bali Deaf Community Denpasar

This study aims to design and build a Sign Language Interpreter Device with Voice Output in the form of an ATMega328 Microcontroller-Based Voice Speaker Module so that in its implementation and later in designing this device the writer focuses on the translation of 16 words that have been predetermined in Indonesian Sign Language especially in Denpasar City by using a Flex Sensor and a Gyro Sensor based on the ATMega328 Microcontroller with Arduino IDE programming. This device is also equipped with a 4GB SD card memory for storing voice recordings, using an ATMega328 microcontroller, four analog Flex sensors, a Gyro sensor, a buzzer and an 8 ohm speaker, and using a 7.4 volt Li-Po battery. The application of this device is aimed for thehearing impaired people who fall into the adult category who can understand writing and understand sign language. The output of this device uses an MP3 player module that is already included in the Sign Language Interpreter Device. The flex sensor readings range from 998-1005 ADC (analog digital converter) in open conditions and the sensor ranges from 1006-10018 ADC in closed conditions. The reading for the gyro pitch (Y axis) ranges from -10º to 76º then on the reading of the gyro Roll (X axis) ranges from -100º to 90º. Keywords: ATMega328 microcontroller; Buzzer; Flex Sensor; Gyro Sensor

Improving Calculation Accuracy of Digital Filters Based on Finite Field Algebra

The applications of digital filters based on finite field algebra codes require their conjugation with positional computing structures. Here arises the task of algorithms and structures developed for converting the positional notation codes to finite field algebra codes. The paper proposes a method for codes conversion that possesses several advantages over existing methods. The possibilities and benefits of optimization of the computational channel structure for digital filter functioning based on the codes of finite field algebra are shown. The modified structure of computational channel is introduced. It differs from the traditional structure by the fact that there is no explicit code converter in it. The main principle is that the “reference” values of input samples, which are free from the error of the analog-digital converter, are used as input samples. The proposed approach allows achieving a higher quality of signal processing in advanced digital filters.

Changing the Delay of the Analog-Digital Conversion in Reduce the Leakage Signal Effect

The research of reduction the leakage signal effect in short range radiolocation system is considered. LFM signal is used as a probe signal. The structure of the differential frequency signal and the structure of operating harmonic are shown for the spectral method of processing the useful signal. To reduce the leakage signal effect, it is proposed to use subsampling of the useful signal with a variable delay of the clock signal of the analog-to-digital converter. The dependence between the level of the parasitic component of the operating harmonic signal, due to the leakage signal effect, and the delay of the clock signal of the analog-digital converter, is given. The clock signal of the analog-digital converter is generated by a microcontroller timer. The timer is initialized in pulse width modulation mode. The required delay of the clock signal of the analog-digital converter is selected by changing the threshold of the timer. For testing the algorithm, a microwave module K-LC5 and a prototype board with a microcontroller STM32F407 are used.

Teknik Pengenalan Suara Musik Pada Robot Seni Tari

The dancing robot has become an annual competition in Indonesia that needs to be developed to improve robot performance. The dancing robot is a humanoid robot that has 24 degrees of freedom. For 2018 the theme raised was "Remo Dancer Robot". Sound processing provides a very important role in dance robots. This robot moves dancing to adjust to the rhythm of the music. The robot will stop dancing when the music is mute. The resulting sound signal is still analogous. Voice signals must be changed to digital data to access the signal. Convert analog to digital signals using Analog Digital Converter (ADC). ADC data is taken by sampling time 254 data per second. The sampling data is stored and grouped per 1 second to classify the parts of Remo Dance music. The results of data classification are in the form of digital numbers which then become a reference to determine the movement of the robot. Robots can recognize conditions when music is in a mute or a play condition.

Perancangan Thermometer Digital tanpa Menggunakan Mikrokontroler

Suhu adalah suatu pengukuran yang menunjukan kondisi panas dari sebuah benda atau kondisi panas tubuh dari manusia maupun hewan. Suhu mempunyai data analog sehingga data yang baca agak sulit. Data analog bersifat continues yang artinya data tersebut memiliki sifat berkesinambungan. Berbeda dengan data digital yang merupakan data diskrit. Oleh karena itu dibutuhkan sebuah pegubah sinyal atau data yang dapat merubah data analog menjadi data digital atau yang biasa disebut juga dengan Analog Digital Converter (ADC). Perancangan ini hanya menggunakan ADC sebagai pembaca data analog dan mengubah menjadi digital yang mana di tampilkan melalui LED.